Rheumatoid Arthritis Shared Epitope and Oxidative Stress
Author Information
Author(s): Ling Song, Li Zhanguo, Borschukova Olga, Xiao Liqun, Pumpens Paul, Holoshitz Joseph
Primary Institution: University of Michigan
Hypothesis
Does the rheumatoid arthritis shared epitope increase cellular susceptibility to oxidative stress?
Conclusion
The rheumatoid arthritis shared epitope activates a nitric oxide-mediated pro-oxidative pathway, increasing cellular vulnerability to oxidative damage.
Supporting Evidence
- Cells with the shared epitope showed increased levels of reactive oxygen species.
- SE-positive cells had diminished cAMP-dependent signaling.
- NO production was linked to increased oxidative stress in SE-positive cells.
- Cells exposed to SE showed higher vulnerability to oxidative DNA damage.
Takeaway
The shared epitope in rheumatoid arthritis makes cells more sensitive to damage from stress, like when they are exposed to harmful substances.
Methodology
The study measured cAMP levels, adenylyl cyclase activity, and protein kinase A activity, and quantified reactive oxygen species and oxidative DNA damage using various assays.
Participant Demographics
The study involved 40 donors, with 32 carrying SE-positive HLA-DRB1 alleles and 8 being SE-negative.
Statistical Information
P-Value
1.4 × 10^-5
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
Want to read the original?
Access the complete publication on the publisher's website